[gentoo-dev] [PATCH] python-utils-r1.eclass: Eliminate false positives from occluded check

["Michał Górny" <mgorny@gentoo.org>]

Modify the occluded package check to unidirectionally check for
additional files in installed package directory.  This eliminates false
positives when the source directory contains additional files,
in particular C sources.

This change also eliminates the dependency on diff(1), in favor
of comm(1).  As a side effect, we no longer compare .py files for
equality but that shouldn't be such a big deal.

Signed-off-by: Michał Górny <mgorny@gentoo.org>
---
 eclass/python-utils-r1.eclass | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/eclass/python-utils-r1.eclass b/eclass/python-utils-r1.eclass
index 27157a003ab2..b67cbb7db298 100644
--- a/eclass/python-utils-r1.eclass
+++ b/eclass/python-utils-r1.eclass
@@ -1244,14 +1244,13 @@ _python_check_occluded_packages() {
 	# positives before filing bugs.
 	[[ ! ${PYTHON_EXPERIMENTAL_QA} ]] && return
 
-	type -P diff &>/dev/null || return
 	[[ -z ${BUILD_DIR} || ! -d ${BUILD_DIR}/install ]] && return
 
 	local sitedir="${BUILD_DIR}/install$(python_get_sitedir)"
 	# avoid unnecessarily checking if we are inside install dir
 	[[ ${sitedir} -ef . ]] && return
 
-	local f fn diff
+	local f fn diff l
 	for f in "${sitedir}"/*/; do
 		f=${f%/}
 		fn=${f##*/}
@@ -1260,17 +1259,26 @@ _python_check_occluded_packages() {
 		[[ ${fn} == *.dist-info || ${fn} == *.egg-info ]] && continue
 
 		if [[ -d ${fn} ]]; then
-			diff=$(diff -dupr -x "__pycache__" "${fn}" "${sitedir}/${fn}")
+			(
+				cd "${sitedir}" && find "${fn}" -type f |
+					grep -v /__pycache__/ | sort
+			) > "${T}"/py-installed || die
+			(
+				find "${fn}" -type f |
+					grep -v /__pycache__/ | sort
+			) > "${T}"/py-source || die
+
+			diff=$(comm -1 -3 "${T}"/py-source "${T}"/py-installed || die)
 			if [[ -n ${diff} ]]; then
 				eqawarn "The directory ${fn} occludes package installed for ${EPYTHON}."
-				echo
-				echo ">>> Diff:"
-				echo "${diff}"
-				echo "<<< End-of-diff"
-				echo
+				eqawarn "The installed package includes additional files:"
+				eqawarn
+				while IFS= read -r l; do
+					eqawarn "    ${l}"
+				done <<<"${diff}"
+				eqawarn
 
 				if [[ ! ${_PYTHON_WARNED_OCCLUDED_PACKAGES} ]]; then
-					eqawarn "The complete build log includes diffs."
 					eqawarn "For more information on occluded packages, please see:"
 					eqawarn "https://projects.gentoo.org/python/guide/test.html#importerrors-for-c-extensions"
 					_PYTHON_WARNED_OCCLUDED_PACKAGES=1
-- 
2.41.0